Loxodes Magnus (Ciliate). It's by far one of the prettiest microorganisms.😍❤️

"The genus Loxodes has specially constructed Müller vesicles. These are constant vacuoles in which a druse of barium sulfate crystals sits on a plasma stalk (s. also Loxodes striatus). It is assumed that this organelles serves for orientation in the water body, similar to an organ of balance. Loxodes magnus has 10–24 of these organelles, which are arranged in a row on the dorsal side. They can be recognized quite easily by the highly refractive barium sulfate crystals" - realmicrolife.com